[Kenwood] TS-940S Cooling Fan Problem

[Bill Stewart]

Thanks Walt for the reply...
I would say for the fan to reliability start every time, it needs at least 
1.5vdc, maybe a tad more. Sometimes it will try to start at a slightly lower 
voltage. Once the voltage gets beyond 1.5 or so, it runs & starts fine. It 
draws around 80ma or so when its trying to start. That's probably why the 
voltage drops from a no-load value of around 18vdc.

Thanks to all for the other comments. I think the the prudent thing to do is 
can this fan. I got to thinking about replacing it with a small 120vac 
muffin fan mounted to the existing fan cage. On my power trans. there seems 
to be two 120v primary windings. I was thinking about hooking the muffin fan 
to the 120v side and let it run all the time (with the unit turned on). I'm 
not sure how much current the fan would pull or how much headroom there is 
on the fuse. A dropping resistor could be used to slow it down if needed. At 
least I could hear it running...and as Tim the Tool Man says....MORE 
POWER...uuuGGGGHHHHH......de Bill Stewart K4JYS
----- Original Message ----- 
From: "Walt Breining" <n9wb at nltc.net>
To: "Bill Stewart" <bstewart at ipass.net>; <kenwood at mailman.qth.net>
Sent: Thursday, October 27, 2005 8:12 PM
Subject: Re: [Kenwood] TS-940S Cooling Fan Problem


> Bill:
> You said that you tried it on another DC supply? Did it run ok or did it
> still start slow?
> If it still started slow, it probably is the fan.
> If it starts ok on a good DC supply, there could be a problem with the
> circuitry that powers the fan.
>
> Vy 73, Walt N9WB
> Good audio is an Amateur Radio tradition, not a crime.
>
> ----- Original Message ----- 
> From: "Bill Stewart" <bstewart at ipass.net>
> To: "kenwood at mailman.qth.net" <Kenwood at mailman.qth.net>
> Sent: Thursday, October 27, 2005 8:25 AM
> Subject: [Kenwood] TS-940S Cooling Fan Problem
>
>
>> I have a TS-940S, s/n 6040XXX, which has a sluggish cooling fan (on left,
> facing front, behind the power trans.). Sometimes it will not start. I 
> have
> shot WD-40 in it and tried to get oil to go down the shaft but sometimes 
> it
> still won't start and if it does start, it turns slowly & erratically. I
> measured the voltage to be around 18VDC with the fan disconnected and
> connected, a fluctuating .5 to 1.5VDC with the erratic rotation.
>> Questions: 1. Is this no-load to load voltage drop normal?
>>                  2. Does the voltage and fan speed increase with temp.
> rise?
>>                  3. If the above is a problem, are there any mods. to
> replace this fan or maybe make the fan run all the time?
>> The fan runs ok if it gets beyond the low start-up point (on a seperate 
>> DC
> supply).
>> Any comments will be appreciated, thanks...Bill K4JYS
>> ______________________________________________________________
>>
>
>